Chusetts



Dec. 3, 1929. G, w, FLEMlNG ,737,580

CUTTER K Filed March l5. 1928 z8 Y zo latented Dec. 3, 1929 narran stares PATENT FFICE'.`

GEORGE W. FLEMING, OF WORCESTER, MASSACHUSETTS, ASSEGNOR TO FLEMING- MIA- CHINE COMPANY, CF \VORCESTER, MASSACHUSETTS, A CORPORATION F MASSA` CHUSETTS CUTTER Application tiled March 15, 1928.

rlhis invention relates to a cutter for shaping a circular surface and is particularly adaptable :tor use in forming a hollow comcal surface such as a valve seat. The principal objects o1 the invention are to provide a construction in which the body of the cutter' is made of material that is coniparatively inexpensive and easily worked and to provide means for setting the cutting teeth in this material in such a way that they are firmly fixed in place and can bc ground conveniently.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompany ing drawings in which Fig. 1 is a side view ol a complete cutter constructed in accordance with this invention;

Fig. 2 is an end view;

Fig. 3 is a central diametrical sectional view of the cutter;

Fig. 4l is an end view of the body of the cutter before the teeth are applied;

Fig. 5 is an enlarged sectional view on the line 5 5 of Fig'. 4:;

Fig. 6 is an enlarged sectional view on the line 6-6 of Fig. f1;

Fig. 7 is a si-de view of one of the cutting '30 blades;

Fig. 8 is an end view of the same;

9 is a sectional view similaito Fig. 5 but showing the cutting blade in position; and

Fig. 10 is a view like Fig. 6, but showing the cutting blade in position.

The cutter is shown in a 'form in which it has a conical cutting surface and is designed for forming and truing valve seats, but of course, the invention is capable of use 'for other purposes. The cutter comprises a main body 10 consisting of a piece of sheet metal shaped to have a conical surface. The outer end is brought to a cylindrical :torni and a cap 11 put on which projects over these ends Serial No. 262,006.

having a surrounding iange 12 for that purpose. A errule 13 is introduced through the two pieces 1() and 11 and flanged over to hold these pieces together and forni a unitary structure. which is applied in any usual way.

This body 10, as well as the plate 11, is formed of soft sheet metal which can be worked in a punch or die-press and tormed very rapidly. Itis provided with a series of slots 15 Vformed by slitting the metal and punching through to form flanges 16 on both sides of the slot extending through to the inner side. The slots 15 are arranged tangent to a circle concentric with the cone 10. These slots extend throughout the area which is 'desired for cutting the conical surface.

Into each one of the slots is introduced a cutter 18. This cutter is formed of any desired grade o1 steel that may be suitable for the Work intended and it is given a T-shape as shown in Figs. 7 and 10. The long part of it at the edge is designed to form a cutting edge and the shank is provided with undercut recesses l0 on opposite sides.

lVhen introduced in position, the ends of the flanges 16 are forced inwardly at 20 to engage in these recesses and firmly hold the shank ot the cutting blade in position. At the same time the two langes 16 are `torced together against' the blade and the blade is forced down so that the projecting ends of the T are i'orced firmly against the surface of the conical part 10. In this way the blade is irmly lixed in position by ordinary sheet met-al working processes and it is not liable to get out ot position or to rock to one side in use. These blades project from the conical surface 10 as tar as may be desired and the fact that this is not limited is also an advantage of this invention.

Although the blades are firmly attached, it is possible to remove one oit them and replace it by hand ope ations, if that should The ferrule is to receive a shat't 1d be found Worth While. But the principal feature of the invention is that the blades can be made of fine grades of hardened steel and set in position in the holder by ordinary pressed metal operations and that the body of the support is also formed of pressed metal by simple operations.

Although I have illustrated and described only one form of the invention, l am aware of the fact that modifications can be made therein by any person skilled in the art Without departing from the scope of the invention as expressed in the claims.

Therefore, l do not vvish to be limited in these respects, but what I do claim is l. As an article of manufacture7 a cutter comprising a circular body of soft sheet metal having a series of slots formed therein and a series of steel blades set into said slots and firmly anchored thereto and to gether constituting a cutting tool, each projecting beyond the sheet metal body on the side Vopposite its cutting edge and secured firmly thereto on that side.

2. As an arti-cle of manufacture, a cutting tool comprising a body of sheet metal having a seri-es 'of slots therein, each formed by punching through the metal and leaving tvvo flanges on the opposite sides `of the slot projecting inwardly, a cutting blade having a shank secured in said slot and projee-ting from the surface of the tool, said vflanges being pressed against the shank of the blade lto hold it in position.

`3. As an article of manufacture, a cutting `tool comprising a body of Vsheet metal having a series of slots therein, each having two flanges Ion opposite sides "of the slot projecting inwardly, a ycutting blade having a shank [located in each slot, :the shank `of each tool having undercut recesses on o p- `posite sides and vthe flanges projecting into said recesses to hold the blade against movement in all directions.

l. As an article fof manufacture, a `cutter comprising afciroula'r body ofsoft `sheet metal lof hollovvconstruction 'ha-ving a series fof slots "formed therein and a `series of steel blades set anto said slots, said circular body havfing integral means projecting from the slots intofthe interior `of the hollow body for' hold- .ing the blades.

`5. As yan'article of manufacture, a cutting ztool compnising 'a body of sheet metal hav- :ing =a `series of slots therein, each having Mtwo flanges fon the opposite sides ofthe slot projecting inwardly, and a cutting blade :in\eac`h slot lhavi-ng a shank projecting from the surface of the lItool andhaving opposite :undercut :recesses near its innerend, the ends ofsaid flanges being pressed `into the recesses in the shank to hold the blade in position.

6. As an :article of manufacture, a cutting tool rcomprisin'g azsheet :metal body of unt form thickness throughout, having a series of GEORGE l/V. FLEMING. 

